Life has been difficult since ancient times.

It means that since ancient times, people's lives have been full of hardships, and the cruelty in the world is only clear to those who have experienced it.

Source: Tang Peixiu's "A Brief Account of the Heart-to-heart Meeting of the Zen Master in Huangbei Lianshan": "Every word is epiphany, and the cloud is worshipped:' Drinking water is the source, and the friend is the confidant. Someone wasted 30 years in the Wuzu Association. ”"

Interpretation: I know the ups and downs of the world best. Only when you calm down and think about it, can you suddenly realize that life can't go back to the past. The ups and downs of personal fate, joys and sorrows, are not thrilling to others, but they are puzzles with no answers for themselves, so it is difficult to win the game. What you have experienced, you know the joys and sorrows.